earth science

Soom Shale

Soom Shale is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Soom Shale rather than just read about it. In short: The Soom Shale is a member of the Late Ordovician (Hirnantian) Cederberg Formation (Table Mountain Group) in South Africa, renowned for its remarkable preservation of soft-tissue in fossil material. Deposited in still waters, the unit lacks bioturbation, perhaps indicating anoxic conditions.

Key takeaways

Soom Shale belongs to earth science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Soom Shale to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Soom Shale from memory before moving on to harder problems.

Reference excerpt

The Soom Shale is a member of the Late Ordovician (Hirnantian) Cederberg Formation (Table Mountain Group) in South Africa, renowned for its remarkable preservation of soft-tissue in fossil material. Deposited in still waters, the unit lacks bioturbation, perhaps indicating anoxic conditions. It overlies the Pakhuis tillite and is overlain by the Disa Siltstone. It contains typical Ordovician microfossils, such as chitinozoa, acritarchs and spores, and its shelly fauna is also typical of this time period. Its macrofauna comprises pelagic organisms that sank rapidly to a barren sea floor. These include brachiopods, eurypterids, conodonts, nektaspids, trilobites, a lobopodian and orthoconic cephalopods.

Environment of formation The environment of deposition is considered to be anoxic and occasionally euxinic cold bottom waters, as indicated by the lack of bioturbation and most epibenthic fauna, besides a small amount of transiently colonizing brachiopods during temporary oxic conditions. It was deposited in the immediate aftermath of the Hirnantian glaciation, the most likely primary cause of the Late Ordovician mass extinction.

Preservation The preservation of fossils in the Soom Shale is the opposite of that of normal fossil deposits. Things that in typical preservation conditions are not preserved in the fossil record like soft tissue are preserved in exquisite detail. While hard parts (exoskeleton, etc.) that are normally preserved in the fossil record are demineralized, and are therefore by comparison poorly preserved, usually being preserved in the form of a mould. There is almost no taphonomic distortion, with little evidence of transport, current alignment and no evidence of scavenging. The process of preservation for soft tissues is under debate, but possibly could involve replacement by aluminosilicates, but this could just be an artifact of diagenesis and metamorphism.

Biota

References

External links "The Soom Shale". "The Soom Shale Homepage". "Soom Shale - S. H. Monroe".

Illustrations

Worked examples

Example 1 — a first encounter with Soom Shale

Start with the simplest possible case. Write down what Soom Shale claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Soom Shale before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Soom Shale ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Soom Shale

In research: Soom Shale appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Soom Shale in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Soom Shale is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geologic formations of South Africa, Hirnantian, Lagerstätten, so understanding it makes those chapters shorter.
In everyday life: Look for Soom Shale outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Soom Shale in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Soom Shale means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Soom Shale out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Soom Shale in simple terms?

Why does Soom Shale matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Soom Shale?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Soom Shale.